A contracting Intertropical Convergence Zone during the Early Heinrich Stadial 1

Yiping Yang, Lanlan Zhang (), Liang Yi, Fuchang Zhong, Zhengyao Lu, Sui Wan, Yan Du and Rong Xiang ()
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Yiping Yang: Chinese Academy of Sciences
Lanlan Zhang: Chinese Academy of Sciences
Liang Yi: Tongji University
Fuchang Zhong: Chinese Academy of Sciences
Zhengyao Lu: Lund University
Sui Wan: Chinese Academy of Sciences
Yan Du: Chinese Academy of Sciences
Rong Xiang: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Despite the fact that the response of tropical hydroclimate to North Atlantic cooling events during the Heinrich Stadial 1 (HS1) has been extensively studied in African, South American and Indonesia, the nature of such responses remains debated. Here we investigate the tropical hydroclimate pattern over the Indo-Asian-Australian monsoon region during the HS1 by integrating hydroclimatic records, and examining a δ18Oseawater record from Globigerinoides ruber (white) in the tropical Indian Ocean. Our findings indicate that tropical hydrological conditions were synchronously arid in both hemispheres during the early HS1 (~18.3-16.3 ka) in the Indo-Asian-Australian monsoon region, except for a narrow, wet hydrological belt in northern low latitudes, suggesting the existence of a contracted tropical precipitation belt at that time. This study reveals that the meltwater discharge and resulting changes in global temperatures and El Niño exerted a profound influence on the tropical hydroclimate in the Indo-Asian-Australian monsoon region during the early HS1.

Date: 2023
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DOI: 10.1038/s41467-023-40377-9

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